Tread pattern



FIG. 1 is a front elevational view of a tread pattern according to the present invention:

FIG. 2 is a cross sectional view thereof, taken along the line 2—2 in FIG. 1; and,

FIG. 3 is a top, front, right side perspective view of the tread pattern of FIG. 1. 

The ornamental design for a tread pattern, as shown and described. 